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AirNow is a one-stop source for air quality data, including current and forecast air quality maps and data for more than 500 cities across the U.S., as well as Canada and Mexico. 

CDC's Social Vulnerability Index uses 15 census variables at tract level to help local officials identify communities that may need support in preparing for hazards or recovering from disaster.

Drought Impacts Reporter (DIR): an interactive database of drought impacts in the U.S., by location, data, type, and cost built from stakeholder, government, media and other reports.

The National Environmental Public Health Tracking Network brings together data on environments and hazards, health effects, and population health from national, state, and city sources.